CN105756830B - Combined mechanical oil spout-supercharging electromagnetism jet hybrid fuel jet device - Google Patents

Abstract

The object of the present invention is to provide a combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device, including a booster part, a control part, a double needle valve nozzle part and an injection device housing. The invention adopts double-needle valve nozzles to inject two fuels, fuel oil and gas, which saves space and simplifies the engine structure; uses electromagnetic valves to control the injection process of gas, and the amount of gas injection can be accurately controlled, and the injection device can realize only injection of fuel or gas, and two Simultaneous injection of two fuels, sequential injection of two fuels and other working modes, the engine can work in pure diesel mode and fuel pilot gas mode, with high working reliability. The booster piston is used to pressurize the gas, the gas booster control and the injection control are separated, the gas injection process can be switched between booster and non-pressurization modes, the injection pressure can be adjusted, and "shoe shape", "first slow down" can be obtained The injection pattern of "Fast and Urgent" meets the needs of the engine for mixing oil and gas under different working conditions.

Description

Combined Mechanical Fuel Injection-Boost Electromagnetic Jet Mixed Fuel Injection Device

technical field

The invention relates to a fuel injection device, in particular to a dual-fuel engine injection device.

Background technique

With the continuous consumption of fossil fuels and the increasingly stringent emission regulations of internal combustion engines, the development of engines is facing the dual pressure of energy crisis and environmental pollution. The use of alternative fuels is an effective means to solve both energy problems and environmental pollution. Natural gas and petroleum gas have become the main substitute fuels for internal combustion engines due to their abundant resources, low price, clean combustion, and high calorific value.

At present, there are two main fuel supply methods for dual-fuel engines: one is to mix the gaseous fuel with the inhaled air before it is introduced into the engine cylinder, and then directly inject a certain amount of liquid fuel near the top dead center of the combustion chamber, thereby causing Burning gas fuel, this method is likely to cause engine knocking, and in addition, when the engine is under low load, the pre-mixed gas is too thin to be conducive to combustion. Another method is to inject the gas directly into the combustion chamber, and also use the pilot amount of liquid fuel to trigger the combustion of the gas fuel. This method will not cause the engine to deflagrate prematurely, and the fuel burns in the diffusion combustion mode, and the combustion effect is good. , but it also has certain problems: First, the structure of the modern engine cylinder head is complex and there are many parts, so it is difficult to arrange two injectors. In addition, if two injectors are installed to inject dual fuel, the original The diesel engine has undergone major changes, increasing the complexity of device processing and assembly. Second, in order to improve the mixing degree of oil and gas, a supercharging device is usually used to pressurize the gas to increase the gas injection pressure. Compared with liquid fuel, if the gas is boosted by a high-pressure pump, the transmission process from the pump end to the injection device will Pipeline structure, tightness and strength requirements are high. Third, the injection device has high requirements for gas sealing. With the movement of the needle valve, the gas leaks upward along the gap between the needle valve coupler, and the leaked gas enters the control chamber, resulting in a decrease in the gas injection pressure and injection rate, which seriously affects the working stability of the device.

Contents of the invention

The object of the present invention is to provide a combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device in which the injection process can be switched between supercharged or non-supercharged modes, and the injection pressure can be adjusted.

The purpose of the present invention is achieved like this:

The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention is characterized in that:

Including the booster part, injection device body, injection device inner cylinder, needle valve base, fuel injection part, gas injection part, the needle valve base is installed under the injection device body through the nozzle sleeve, the injection device inner cylinder is installed in the injection device body, The needle valve base includes a fuel base and a gas base;

The booster part includes a booster solenoid valve, a booster piston, a booster piston sleeve, and an intake valve, and the booster solenoid valve includes a booster solenoid valve seat, a booster electromagnet, a booster armature, and a booster solenoid valve stem. The booster solenoid valve seat is provided with a servo oil inlet port and a servo oil drain port. One end of the booster solenoid valve rod is fixed on the booster armature through a booster stop ring, and the other end passes through the booster solenoid valve seat and is placed on the The pre-tightening force of the booster solenoid valve spring on it presses down on the baffle plate, the position of the booster armature forms a booster armature chamber, the position of the booster solenoid valve spring forms a booster solenoid valve spring cavity, and the booster solenoid valve An annular oil belt is set on the valve stem, and the annular oil belt realizes the connection or disconnection between the servo oil inlet port and the booster armature chamber and the communication between the servo oil drain port and the booster solenoid valve spring chamber through the movement of the booster solenoid valve stem. Or disconnect; the booster piston is installed in the booster piston sleeve, the booster piston sleeve is installed under the booster solenoid valve seat, and the servo oil chamber is formed between the upper end of the booster piston, the booster piston sleeve and the booster solenoid valve seat , a booster chamber is formed between the lower end of the booster piston and the booster piston sleeve, and the booster piston spring is set on the booster piston; the intake valve is a one-way valve, installed in the booster piston sleeve, on the booster piston sleeve A gas inlet is provided, the gas inlet is connected to the intake valve, and the outlet of the intake valve is connected to the booster chamber;

The fuel injection part includes a locking nut, a pressure regulating screw, an adjusting spring, a fuel needle valve ejector rod, and a fuel needle valve. The locking nut is installed outside the pressure regulating screw, and the pressure regulating screw is threadedly connected to the inner cylinder of the injection device. The locking nut and the pressure regulating screw are all set in the injection device body, the fuel needle valve ejector rod is arranged in the inner cylinder of the injection device, the pressure regulating spring is installed between the fuel needle valve ejector rod and the pressure regulating screw, and the fuel needle valve is arranged in the fuel base , the fuel needle valve is located under the fuel needle valve ejector rod, the fuel injection hole is set at the end of the fuel base, and an oil tank is formed between the fuel needle valve and the fuel base, and the fuel injection device body is respectively provided with a fuel inlet joint and a low-pressure oil drain port, and the fuel oil The oil inlet joint is connected to the oil tank, and the inner cylinder of the injection device is provided with an annular oil tank, which is respectively connected to the cavity where the lock nut is located and the low-pressure oil drain port;

The gas injection part includes a control gas solenoid valve installed in the inner cylinder of the injection device, a gas needle valve limit rod and a gas needle valve installed in the gas base. The control gas solenoid valve includes a solenoid valve body, an electromagnet, Armature, valve stem upper seal base, valve stem lower seal base, solenoid valve spring, solenoid valve stem, solenoid valve body, valve stem upper seal seat, valve stem lower seal seat and gas needle valve limit rod are arranged from top to bottom , the electromagnetic valve cavity is formed between the solenoid valve body and the upper sealing base of the valve stem, and the groove cavity is formed between the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, and the armature is located under the electromagnet. One end of the valve stem of the solenoid valve is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem under the armature, and cooperates with the lower sealing base of the valve stem. The matched upper sealing cone surface and the lower sealing cone surface matched with the lower sealing base of the valve stem, the part where the valve stem of the solenoid valve matches the upper sealing base of the valve stem forms a low-pressure oil ring belt, and the valve stem of the solenoid valve and the lower sealing base of the valve stem The matching parts form a high-pressure oil ring belt, the first oil passage and the fourth oil passage are arranged on the sealing base of the valve stem, the second oil passage and the third oil passage are arranged on the sealing base of the valve stem, and the inner cylinder of the injection device is arranged The fifth oil passage, the control oil inlet is set on the injection device body, the first oil passage connects the solenoid valve cavity and the low-pressure oil drain port, the second oil passage connects the high-pressure oil ring belt and the control oil inlet, and the gas needle valve limit rod is set The center oil passage, the third oil passage is connected to the groove cavity and the central oil passage, the fourth oil passage is connected to the low-pressure oil ring belt solenoid valve chamber, the gas needle valve is located under the gas needle valve limit rod, between the gas needle valve and the gas base A sealing ring and a gas chamber are respectively formed, the sealing ring is connected to the control oil inlet through the fifth oil passage, the gas chamber is connected to the pressurization chamber through the gas channel in the inner cylinder of the injection device, and gas injection holes are arranged at the end of the gas base.

The present invention may also include:

1. A cavity is formed between the lower part of the upper end of the booster piston and the booster piston sleeve.

2. The upper end of the gas needle valve is designed with a circular step. The gas needle valve control chamber is formed between the lower part of the circular step and the injection device body. The lower end of the gas needle valve limit rod is set inside the circular step of the gas needle valve. The gas needle valve control cavity communicates with the groove cavity.

3. When the control gas solenoid valve is not energized, the solenoid valve stem is pressed on the sealing base under the valve stem, the high-pressure oil ring is closed, the low-pressure oil ring is opened, and the gas needle valve control chamber is connected to the low-pressure oil drain port; the control gas solenoid When the valve is energized, the solenoid valve stem is lifted and pressed against the sealing base on the valve stem, the low-pressure oil ring is closed, the high-pressure oil ring is opened, and the gas needle valve control chamber is connected to the control oil inlet.

The advantage of the present invention is that: the combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention uses double needle valve nozzles to inject two kinds of fuel, which saves space and simplifies the engine structure. The fuel injection process is controlled by a mechanical structure, and the structure is simple; the gas injection process is controlled by a solenoid valve, and the gas injection volume is accurately and controllable. The injection device can work in pure diesel mode and fuel pilot gas mode to meet the requirements of the engine under different working conditions. Requirements for oil and gas mixing, high working reliability. In addition, the gas boosting control and injection control of this device are separated, so that the flexible design of the gas injection characteristic curve can be realized, not only can the gas injection process be switched between supercharged and non-pressurized modes arbitrarily, but also can realize the control of gas injection regardless of the starting point of gas injection. Press the starting moment, so as to obtain the "shoe-shaped", "slow first and then fast" jet pattern.

At the same time, the device has the following beneficial effects: the device controls the oil drain circuit to flow through the upper part of the solenoid valve body, and the heat is taken away through the oil drain cycle to reduce the temperature of the solenoid valve part, ensuring the reliability and stability of the solenoid valve. A sealing ring is designed between the gas needle valve and the needle valve seat, and part of the control oil is introduced as the sealing oil to seal the gas, which can effectively prevent gas leakage. At the same time, the control oil in the control chamber and the sealing oil in the sealing ring are of the same type Oil and oil pressure are equal, which can effectively ensure that the control oil and sealing oil have no static leakage.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2a is a schematic diagram of the structure of the booster part, Figure 2b is a schematic diagram of the structure of the booster solenoid valve, Figure 2c is a schematic diagram of the structure of the intake valve, Figure 2d is a schematic diagram of the position 1 of the annular oil belt, and Figure 2e is a schematic diagram of the position 2 of the annular oil belt ;

Figure 3a is a schematic diagram of the structure of the control part, Figure 3b is a schematic diagram of the control gas solenoid valve, Figure 3c is a schematic diagram of the valve stem position 1 of the solenoid valve, and Figure 3d is a schematic diagram of the valve stem position 2 of the solenoid valve;

Figure 4 is a partial schematic view of the double needle valve nozzle.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

1 to 4, the combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention is mainly composed of a booster part 1, a control part 2, a double needle valve nozzle part 5, an oil inlet filter element 7 and an injection device body 8 composition. The injection device body 8 is designed with a low-pressure oil drain port 3, a control oil inlet 4, a fuel oil inlet connector 6, etc., and the fuel oil inlet filter element 7 is located in the fuel oil inlet connector 6. The booster part 1 mainly includes a booster solenoid valve 9, a booster piston 10, a booster piston spring 11, a booster piston sleeve 12, an intake valve 14, a booster chamber 15, a servo oil chamber 17, and the like. The control part 2 mainly includes control gas solenoid valve 34, gas needle valve limit rod 35, gas needle valve spring 37, gas needle valve control cavity 38, fuel needle valve ejector rod 39, injection device inner cylinder 40, pressure regulating spring 41, Pressure regulating screw 43, lock nut 44, etc., all components are positioned and installed in the inner cylinder 40 of the injection device. The inner cylinder 40 of the injection device is designed with an annular oil groove 42, and the gas needle valve limit rod 35 is designed with a central oil tank. Road 36. The double needle valve nozzle part 5 mainly includes a gas needle valve 62, a fuel needle valve 69, a needle valve base 72, a nozzle cover 73, a sealing ring 74, etc., and the gas needle valve 62 and the fuel needle valve 69 share a needle valve base 72. The upper end of the gas needle valve 62 is designed with a circular step. Below the circular step, a gas needle valve control cavity 38 is formed between the gas needle valve 62 and the injection device body 8. The gas needle valve 62 and the gas needle valve limit rod 35 Coaxial installation, the control oil enters the gas needle valve control cavity 38 through the central oil passage 36 on the gas needle valve limit rod 35 . A sealing ring 64 is designed between the gas needle valve 62 and the needle valve base 72 , and part of the control oil is introduced into the sealing ring 64 through the oil passage 63 on the needle valve base 72 .

Booster solenoid valve 9 is composed of solenoid valve seat 19, solenoid valve spring 20, solenoid valve stem 22, spring washer 23, baffle plate 24, armature 25, solenoid valve body 26, stop ring 27, coil 28, electromagnet 29, etc. . Wherein the solenoid valve rod 22 is designed with an annular oil belt 21 , and the solenoid valve seat 19 is designed with a servo oil inlet 30 , a servo oil drain 18 and a gas inlet 13 . When the solenoid valve 9 is not energized, the annular oil belt 21 communicates with the oil drain port 18 and the servo oil chamber 17 through the oil passage; The intake valve 14 is a one-way valve, installed on the booster piston sleeve 12, and mainly includes an intake valve seat 31, an intake valve spring 32, an intake valve stem 33, and the like.

Control gas solenoid valve 34 mainly includes solenoid valve body 45, electromagnet 46, coil 47, armature 48, valve stem upper seal base 50, solenoid valve spring 51, solenoid valve stem 52, valve stem lower seal base 53, stop ring 61 etc. The solenoid valve stem 52 is designed with two sealing cones, and is designed with a high-pressure oil ring belt 56 and a low-pressure oil ring belt 58. Press down on the lower sealing base 53 of the valve stem, the high-pressure oil ring 56 is closed, and the low-pressure oil ring 58 is opened; when the control gas solenoid valve 34 is energized, the solenoid valve stem 52 is lifted and pressed on the upper sealing base 50 of the valve stem, The low-pressure oil ring belt 58 is closed, and the high-pressure oil ring belt 56 is opened.

The combined mechanical fuel injection-supercharged electromagnetic jet hybrid fuel injection device of the present invention is mainly composed of a booster part 1, a control part 2, a double needle valve nozzle part 5, an oil inlet filter element 7 and an injection device body 8. The injection device body 8 is designed with a low-pressure oil drain port 3, a control oil inlet 4, and a fuel inlet connector 6, etc., the fuel inlet filter element 7 is located in the fuel inlet connector 6, and the gas inlet 9 is located on the pressurized part 1.

The pressurized part 1 is located above the injection device body 8, and the two are connected by threads. The booster part 1 mainly includes a booster solenoid valve 9, a booster piston 10, a booster piston spring 11, a booster piston sleeve 12, an intake valve 14, a booster chamber 15, a servo oil chamber 17, and the like. Wherein, booster solenoid valve 9 is made of solenoid valve seat 19, solenoid valve spring 20, solenoid valve stem 22, spring washer 23, baffle plate 24, armature 25, solenoid valve body 26, stop ring 27, coil 28, electromagnet 29 and so on. The intake valve 14 is a one-way valve, installed on the booster piston sleeve 12, and mainly includes an intake valve seat 31, an intake valve spring 32, an intake valve stem 33, and the like. The solenoid valve stem 22 of the booster solenoid valve 9 is designed with an annular oil belt 21 , and the solenoid valve seat 19 is designed with a servo oil inlet 30 , a servo oil drain 18 and a gas inlet 13 . One end of the solenoid valve stem 22 is fixed on the solenoid valve armature 25 through the stop ring 27, and can move left and right together with the armature 25. 24 on. The electromagnetic valve seat 19 can limit the lift of the electromagnetic valve rod 22, and an oil passage is designed on it, which can guide part of the servo oil to flow through the electromagnetic valve 9, cool the electromagnetic valve 9 and reduce the armature of the electromagnetic valve. 25 and the effect of the shock and vibration of valve rod 22 left and right motions. A servo oil cavity 17 is formed between the pressure surface above the large head of the booster piston 10 and the piston sleeve 12 and the solenoid valve seat 19, and a booster chamber 15 is formed between the pressure surface below the small head of the booster piston 10 and the piston sleeve 12. The return spring 32 of the intake valve 14 has a small pretightening force and low opening pressure. When the gas enters the intake valve 14, the valve stem 33 is opened under the action of the gas, and the gas enters the booster chamber 15; When the gas pressure in the pressure chamber 15 rises, the intake valve 14 is closed. The booster piston 10 and the booster piston sleeve 12 are a pair of precision couples with a small matching gap and a large contact length, which can effectively prevent the gas in the booster chamber 15 from going up and prevent the fuel oil in the servo oil chamber 17 from leaking; A large cavity 16 is formed between the big head of the pressure piston 10 and the groove of the piston sleeve 12. Even if some gas and fuel oil leak into the cavity 16, the mixing of oil and gas in the cavity can hinder its further mutual penetration. The oil film formed on the surface is in a dynamic equilibrium state during the piston movement, which can further prevent gas leakage.

The control part 2 is located in the injection device body 8, mainly including the control gas solenoid valve 34, the gas needle valve limit rod 35, the gas needle valve spring 37, the gas needle valve control chamber 38, the fuel needle valve ejector rod 39, and the injection device inner cylinder 40. Pressure regulating spring 41, pressure regulating screw 43, locking nut 44, etc. All components are positioned and installed in the inner cylinder 40 of the injection device. An annular oil groove 42 is designed on the inner cylinder 40 of the injection device, and the gas needle valve limit position A central oil passage 36 is designed on the rod 35 . The pressure regulating spring 41 is installed between the pressure regulating screw 43 and the fuel needle valve mandrel 39, and the pressure regulating screw and the inner cylinder 40 of the injection device are connected by threads, and the pressure regulating spring 41 is pressed on the fuel needle valve mandrel 39, The fuel needle valve push rod 39 presses the fuel needle valve 69 under the pretightening force of the pressure regulating spring 41 . By adjusting the position of the pressure regulating screw 43 , the pretightening force of the pressure regulating spring 41 can be changed, thereby changing the opening pressure of the fuel needle valve 69 . The fuel oil leaked from the gas needle valve 45 and the guide surface of the needle valve flows through the pressure regulating screw 43 and the locking nut 44 , and then flows from the annular oil groove 42 to the low-pressure oil drain port 3 . Control gas solenoid valve 34 mainly includes solenoid valve body 45, electromagnet 46, coil 47, armature 48, valve stem upper seal base 50, solenoid valve spring 51, solenoid valve stem 52, valve stem lower seal base 53, stop ring 61 etc. A solenoid valve cavity 60 is formed between the solenoid valve body 45 and the upper sealing base 50 of the valve stem, and a groove cavity 57 is formed between the upper sealing base 50 of the valve stem and the lower sealing base 53 of the valve stem. The electromagnet 46 is installed in the solenoid valve cavity 60 of the solenoid valve body 45, the armature 48 is located below the electromagnet 46, one end of the solenoid valve stem 52 is stuck on the armature 48 through the stop ring 61, and the other end runs through the valve below the armature 48. The sealing base 50 on the stem is pressed on the sealing base 53 under the valve stem. The solenoid valve stem 52 is designed with two sealing cones, and is designed with a high-pressure oil ring belt 56 and a low-pressure oil ring belt 58. Press down on the lower sealing base 53 of the valve stem, the high-pressure oil ring 56 is closed, and the low-pressure oil ring 58 is opened, as shown in Figure 3(c), at this time the gas needle valve control chamber 38 is connected to the low-pressure oil drain port 3; When the control gas solenoid valve 34 is energized, the solenoid valve stem 52 lifts and presses on the sealing base 50 on the valve stem, the low-pressure oil ring belt 58 is closed, and the high-pressure oil ring belt 56 is opened, as shown in Figure 3(d). The gas needle valve control cavity 38 communicates with the control oil inlet 4 . An oil passage 49 and an oil passage 59 are designed on the sealing base 50 on the valve stem. The oil passage 59 communicates with the low-pressure oil ring belt 58 and the electromagnetic valve chamber 60 , and the oil passage 49 communicates with the electromagnetic valve chamber 60 and the annular oil groove 42 . An oil passage 54 and an oil passage 55 are designed on the sealing base 53 under the valve stem. The oil passage 54 communicates with the high-pressure oil ring belt 56 and the control oil inlet 4, and the oil passage 55 communicates with the groove cavity 57 and the center oil of the gas needle valve limit rod 35. Road 36. The drain oil circuit of the device flows through the solenoid valve, and the heat of the double solenoid valve is taken away by the fuel flow, which plays the role of cooling the solenoid valve, and reduces the impact and vibration of the armature of the solenoid valve moving up and down, thereby improving the work of the double solenoid valve. stability. The double-needle valve nozzle part 5 is located below the injection device body 8 and mainly includes a gas needle valve 62, a sealing ring 64, a gas chamber 66, a fuel needle valve 69, an oil tank 70, a needle valve base 72, a nozzle cover 73, and a sealing ring 74 etc., the gas needle valve 62 and the fuel needle valve 69 share a needle valve base 72 . There are gas inlet passages and air inlet grooves in the middle of the needle valve base 72, and oil inlet grooves and oil inlet passages are all arranged on both sides. The middle air passage introduces high-pressure gas into the gas chamber 66 to meet the air intake requirements of the injection device, the oil passage on one side introduces high-pressure fuel into the oil tank 70 to meet the oil inlet requirements of the injection device, and the oil passage on the other side introduces part of the control oil into the sealing ring 64 sealed gas. The upper end of the gas needle valve 62 is designed with a circular step. Below the circular step, a gas needle valve control cavity 38 is formed between the gas needle valve 62 and the injection device body 8. The gas needle valve 62 and the gas needle valve limit rod 35 Coaxial installation, the control oil enters the gas needle valve control cavity 38 through the central oil passage 36 on the gas needle valve limit rod 35 . The gas needle valve 62 is pressed on the needle valve base 72 to close the gas injection hole 67 under the pretightening force of the gas needle valve spring 37 . Gas enters the booster chamber 15 from the gas inlet 13 on the booster part 1 , flows through the central gas channel on the inner cylinder 40 of the injection device, and then enters the gas chamber 66 through the gas channel 65 on the needle valve base 72 . Above the gas chamber 66, a sealing ring 64 is designed between the gas needle valve 62 and the needle valve base 72, through the oil channel 63 on the needle valve base 72, part of the control oil is introduced to the sealing ring 64 to seal the gas. The fuel needle valve 69 is pressed by the fuel needle valve push rod 39 on the needle valve base 72 to close the fuel injection hole 68 under the action of the pressure regulating spring 41 . The nozzle cover 73 and the injection device body 8 are threadedly connected and a sealing ring 74 is designed to prevent high temperature and high pressure gas in the cylinder from entering the injection device double needle valve nozzle part.

The gas nozzle of the combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention sprays gas. When the gas needle valve is lifted and seated, the gas is easy to leak upward with the movement of the valve stem, and the leaked gas enters the gas. When the needle valve controls the cavity 38, its jet characteristics will be seriously affected due to the compressibility of the gas. In order to solve this problem, the combined mixed fuel injection device of the present invention has a sealing ring 64 between the gas needle valve 62 and the needle valve base 72, and controls the oil sealing gas through the introduction part of the oil passage, which can effectively prevent gas leakage. In addition, the control oil in the control chamber 38 of the gas needle valve and the sealing oil in the sealing ring 64 are the same oil, and the oil pressure on the top and bottom of the needle valve is equal, which can effectively ensure that there is no static leakage of the control oil and the sealing oil.

When the engine is working, the fuel injection process is controlled by the mechanical structure. The fuel in the high-pressure oil pipe flows from the oil inlet joint 6 and the fuel filter element 7 through the oil passage into the oil tank. The fuel needle valve leaves the seat, and the fuel injection hole 68 starts fuel injection, and the preload of the pressure regulating spring can be regulated by the pressure regulating screw. The process of gas boosting and injection is controlled by two solenoid valves respectively. The control unit collects the input signal of the sensor, drives the boosting solenoid valve 9 and controls the gas solenoid valve 34 to work, thereby controlling the gas boosting and injection respectively. When the solenoid valve 9 is powered off, the solenoid valve stem 22 is pressed against the right side baffle plate 24 under the action of the solenoid valve spring 20. At this time, the annular oil belt 21 communicates with the oil drain port 19 and the servo oil chamber 17, as shown in the figure As shown in 2(d), the servo oil in the servo oil chamber 17 flows to the low-pressure oil drain port 19, the pressure in the servo oil chamber 17 decreases, the booster piston 10 moves upward under the action of the return spring 11, and the gas pressure in the booster chamber 15 drops. The gas that enters the intake valve 14 from the gas inlet 13 pushes the intake valve stem 33, and the supercharging device starts to intake air; when the solenoid valve 9 is energized, the electromagnet 29 attracts the armature 25, and the armature 25 drives the solenoid valve stem 22 to the left At this time, the annular oil belt 21 communicates with the servo oil inlet 30 and the servo oil chamber 17, as shown in Figure 2(e), the servo oil enters the servo oil chamber 17, and the pressure in the servo oil chamber 17 gradually increases, pushing the pressurization Piston 10 descends, and the pressure in boost chamber 15 just begins to rise, and intake valve 14 promptly closes, and boost piston 10 continues descending to gas pressurization in boost chamber 15. The gas in the booster chamber 15 enters the gas chamber 66 of the gas nozzle through the gas channel. When the control gas solenoid valve 34 is energized, the solenoid valve rod 52 is lifted, the high-pressure oil ring 56 is opened, the low-pressure oil ring 58 is closed, and the high-pressure control oil flows through the high-pressure oil ring 56, the groove cavity 57, and the gas needle valve in sequence. The central oil channel 36 of the position rod 35 flows into the gas needle valve control chamber 38, the gas needle valve 62 is lifted rapidly under the action of the high-pressure oil in the gas needle valve control chamber 38, the gas injection hole 67 is opened, and the gas injection starts; the gas solenoid valve is controlled 34 When the power is off, the solenoid valve stem 52 is pressed against the sealing base 53 under the valve stem under the action of the solenoid valve spring 51, the high-pressure oil ring belt 56 is turned off, the low-pressure oil ring belt 58 is opened, and the high-pressure oil in the gas needle valve control chamber 38 Through the oil passage, it flows through the groove chamber 57 and the solenoid valve chamber 60 in sequence, and then flows from the oil passage 49 to the low-pressure oil drain port 3, the oil pressure in the gas needle valve control chamber 38 decreases, and the gas needle valve 62 acts on the gas needle valve spring 37. Press down on the needle valve base 72, close the gas injection hole 67, and stop the gas injection. According to the working conditions of the engine, various oil and gas injection modes can be realized by adjusting the opening pressure of the fuel needle valve and selecting the booster solenoid valve 9 and controlling the working state of the gas solenoid valve 34.

From the above working process, it can be seen that the combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device uses double needle valve nozzles to inject fuel and gas fuel, which saves space and simplifies the engine structure. The fuel injection process is controlled by a mechanical structure. Simple, easy to control, and good inheritance to existing diesel engines; the gas injection process is controlled by a solenoid valve, and the gas injection volume is accurately and controllable. The injection device can work in pure diesel mode and fuel pilot gas mode, and the gas injection process can The supercharged and non-supercharged modes can be switched freely, and the injection pressure can be adjusted to meet the requirements of the engine for oil and gas mixing under different working conditions. The nozzle part uses fuel oil to seal the gas, which can effectively prevent gas leakage, and the control oil and sealing oil use the same oil, which can effectively prevent the static leakage of fuel in the control chamber and the sealing ring. Therefore, the invention can make the engine meet the increasingly stringent emission regulations, and effectively improve its power, economy and reliability.

The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention comprises a supercharging part, a control part, a double-needle valve nozzle part and a casing of the injection device. There is a fuel inlet connector, a control oil inlet and a low-pressure oil drain port on the casing of the injection device. A fuel filter element is installed in the fuel inlet connector, and the gas inlet is designed in the pressurized part. The supercharging part mainly includes controlling the supercharging solenoid valve, supercharging piston, supercharging piston sleeve, piston return spring, intake valve, etc. The control part mainly includes the inner cylinder of the injection device, the control gas solenoid valve, the gas needle valve limit rod, the gas needle valve spring, the gas needle valve control chamber, the fuel needle valve ejector rod, the pressure regulating spring, the pressure regulating screw, and the locking nut etc., each component is positioned and installed in the inner cylinder of the injection device. Wherein, the pressure-regulating spring is installed between the pressure-regulating screw and the ejector rod, and the pressure-regulating screw and the inner barrel of the injection device are connected through threads, and the pressure-regulating spring is pressed on the fuel needle valve ejector rod. The double needle valve nozzle part mainly includes gas needle valve, fuel needle valve, needle valve base, sealing ring, nozzle cover, etc. The gas needle valve and fuel needle valve share a needle valve base.

The booster part of the solenoid valve includes a solenoid valve body, an electromagnet, a coil, a solenoid valve stem, a solenoid valve seat, an armature, a stop ring, a solenoid valve spring, a baffle, and the like. The coil and the electromagnet are installed in the solenoid valve body, the armature is located on the right side of the electromagnet, one end of the valve stem of the solenoid valve is stuck on the armature through the stop ring, and the other end is pressed against the baffle under the action of the spring force. The solenoid valve seat is designed with a servo oil inlet and drain port, and the solenoid valve stem is designed with an annular oil belt. When the solenoid valve is energized, the valve stem moves to the left, and the annular oil belt connects the servo oil inlet and the servo oil chamber. Enter the servo oil chamber; when the solenoid valve is powered off, the solenoid valve stem is pushed against the right baffle, the annular oil belt is connected to the servo oil chamber and the oil drain port, and the servo oil flows to the low-pressure oil drain port.

Control gas solenoid valve mainly includes solenoid valve body, electromagnet, coil, armature, solenoid valve stem, stem upper sealing base, valve stem lower sealing base, solenoid valve spring, stop ring, etc. An electromagnetic valve cavity is formed between the electromagnetic valve body and the upper sealing base of the valve stem, and a groove cavity is formed between the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, the armature is located below the electromagnet, one end of which is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem below the armature, and is pressed on the lower sealing base of the valve stem. There are two oil passages designed on the sealing base on the valve stem, one oil passage connects the groove chamber and the solenoid valve chamber, and the other oil passage connects the solenoid valve chamber and the low-pressure oil drain port, and the drain oil passage flows through the solenoid valve body. The sealing base under the valve stem is designed with two oil passages, one oil passage connects the high-pressure oil ring belt and the gas needle valve control chamber, and the other oil passage connects the oil chamber under the valve stem of the solenoid valve and the low-pressure oil drain port.

There are two annular oil belts designed on the valve stem of the control gas solenoid valve, the lower annular oil belt is connected to the control oil inlet through the oil passage, and the upper annular oil belt is connected to the low-pressure oil drain port through the oil passage.

The control gas solenoid valve stem is designed with two sealing cones, the upper sealing cone seals the low-pressure oil ring, and the lower sealing cone seals the high-pressure oil ring. The solenoid valve stem is seated, the high-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the low-pressure oil circuit; the solenoid valve stem is lifted, the low-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the high-pressure oil circuit.

The upper end of the gas needle valve is designed with a circular step. The gas needle valve control chamber is formed between the needle valve and the injection device body under the circular step. The lower end of the gas needle valve limit rod is sleeved inside the circular step of the gas needle valve. The gas needle valve limit rod and the gas needle valve are provided with a central oil passage along the axis, and the gas needle valve control cavity communicates with the electromagnetic valve groove cavity through the oil passage.

The mechanical fuel injection part and the gas control part share a low-pressure oil drain port. An annular oil groove is designed between the injection device body and the inner cylinder of the injection device, and the fuel oil return cavity, the gas solenoid valve cavity and the low-pressure oil drain port are connected through the oil passage.

Above the gas chamber of the gas nozzle, an annular sealing belt is designed between the gas needle valve and the needle valve base, and an annular oil groove and an oil passage are opened on the needle valve base to introduce part of the control oil into the annular sealing belt.

Claims (5)

1. The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device is characterized by: Including the booster part, injection device body, injection device inner cylinder, needle valve base, fuel injection part, gas injection part, the needle valve base is installed under the injection device body through the nozzle sleeve, the injection device inner cylinder is installed in the injection device body, The needle valve base includes a fuel base and a gas base; The booster part includes a booster solenoid valve, a booster piston, a booster piston sleeve, and an intake valve, and the booster solenoid valve includes a booster solenoid valve seat, a booster electromagnet, a booster armature, and a booster solenoid valve stem. The booster solenoid valve seat is provided with a servo oil inlet port and a servo oil drain port. One end of the booster solenoid valve rod is fixed on the booster armature through a booster stop ring, and the other end passes through the booster solenoid valve seat and is placed on the The pre-tightening force of the booster solenoid valve spring on it presses down on the baffle plate, the position of the booster armature forms a booster armature chamber, the position of the booster solenoid valve spring forms a booster solenoid valve spring cavity, and the booster solenoid valve An annular oil belt is set on the valve stem, and the annular oil belt realizes the connection or disconnection between the servo oil inlet port and the booster armature chamber and the communication between the servo oil drain port and the booster solenoid valve spring chamber through the movement of the booster solenoid valve stem. Or disconnect; the booster piston is installed in the booster piston sleeve, the booster piston sleeve is installed under the booster solenoid valve seat, and the servo oil chamber is formed between the upper end of the booster piston, the booster piston sleeve and the booster solenoid valve seat , a booster chamber is formed between the lower end of the booster piston and the booster piston sleeve, and the booster piston spring is set on the booster piston; the intake valve is a one-way valve, installed in the booster piston sleeve, on the booster piston sleeve A gas inlet is provided, the gas inlet is connected to the intake valve, and the outlet of the intake valve is connected to the booster chamber; The fuel injection part includes a locking nut, a pressure regulating screw, an adjusting spring, a fuel needle valve ejector rod, and a fuel needle valve. The locking nut is installed outside the pressure regulating screw, and the pressure regulating screw is threadedly connected to the inner cylinder of the injection device. The locking nut and the pressure regulating screw are all set in the injection device body, the fuel needle valve ejector rod is arranged in the inner cylinder of the injection device, the pressure regulating spring is installed between the fuel needle valve ejector rod and the pressure regulating screw, and the fuel needle valve is arranged in the fuel base , the fuel needle valve is located under the fuel needle valve ejector rod, the fuel injection hole is set at the end of the fuel base, and an oil tank is formed between the fuel needle valve and the fuel base, and the fuel injection device body is respectively provided with a fuel inlet joint and a low-pressure oil drain port, and the fuel oil The oil inlet joint is connected to the oil tank, and the inner cylinder of the injection device is provided with an annular oil tank, which is respectively connected to the cavity where the lock nut is located and the low-pressure oil drain port; The gas injection part includes a control gas solenoid valve installed in the inner cylinder of the injection device, a gas needle valve limit rod and a gas needle valve installed in the gas base. The control gas solenoid valve includes a solenoid valve body, an electromagnet, Armature, valve stem upper seal base, valve stem lower seal base, solenoid valve spring, solenoid valve stem, solenoid valve body, valve stem upper seal seat, valve stem lower seal seat and gas needle valve limit rod are arranged from top to bottom , the electromagnetic valve cavity is formed between the solenoid valve body and the upper sealing base of the valve stem, and the groove cavity is formed between the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, and the armature is located under the electromagnet. One end of the valve stem of the solenoid valve is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem under the armature, and cooperates with the lower sealing base of the valve stem. The matched upper sealing cone surface and the lower sealing cone surface matched with the lower sealing base of the valve stem, the part where the valve stem of the solenoid valve matches the upper sealing base of the valve stem forms a low-pressure oil ring belt, and the valve stem of the solenoid valve and the lower sealing base of the valve stem The matching parts form a high-pressure oil ring belt, the first oil passage and the fourth oil passage are arranged on the sealing base of the valve stem, the second oil passage and the third oil passage are arranged on the sealing base of the valve stem, and the inner cylinder of the injection device is arranged The fifth oil passage, the control oil inlet is set on the injection device body, the first oil passage connects the solenoid valve cavity and the low-pressure oil drain port, the second oil passage connects the high-pressure oil ring belt and the control oil inlet, and the gas needle valve limit rod is set The center oil passage, the third oil passage is connected to the groove cavity and the central oil passage, the fourth oil passage is connected to the low-pressure oil ring belt solenoid valve chamber, the gas needle valve is located under the gas needle valve limit rod, between the gas needle valve and the gas base A sealing ring and a gas chamber are respectively formed, the sealing ring is connected to the control oil inlet through the fifth oil passage, the gas chamber is connected to the pressurization chamber through the gas channel in the inner cylinder of the injection device, and gas injection holes are arranged at the end of the gas base. 2. The combined mechanical fuel injection-supercharged electromagnetic jet hybrid fuel injection device according to claim 1, characterized in that: a cavity is formed between the bottom of the upper end of the booster piston and the booster piston sleeve. 3. The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 1 or 2, characterized in that: the upper end of the gas needle valve is designed with a circular step, the bottom of the circular step and the body of the injection device A gas needle valve control cavity is formed between them, the lower end of the gas needle valve limit rod is sleeved inside the circular step of the gas needle valve, and the gas needle valve control cavity communicates with the groove cavity. 4. The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 1 or 2, characterized in that: when the control gas solenoid valve is not energized, the valve stem of the solenoid valve is pressed against the sealing base under the valve stem , the high-pressure oil ring belt is closed, the low-pressure oil ring belt is opened, and the gas needle valve control chamber is connected to the low-pressure oil drain port; The belt is closed, the high-pressure oil ring is opened, and the gas needle valve control chamber is connected with the control oil inlet. 5. The combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 3, characterized in that: when the control gas solenoid valve is not energized, the valve stem of the solenoid valve is pressed on the lower sealing base of the valve stem, and the high pressure The oil ring is closed, the low-pressure oil ring is opened, the gas needle valve control chamber is connected to the low-pressure oil drain port; when the control gas solenoid valve is energized, the valve stem of the solenoid valve is lifted and pressed against the sealing base on the valve stem, and the low-pressure oil ring is closed 1. The high-pressure oil ring is opened, and the gas needle valve control chamber is connected with the control oil inlet.